Results 1 to 12 of 12

Thread: Project 8600GTX

  1. #1
    Xtreme Member
    Join Date
    Jul 2008
    Location
    Poland
    Posts
    378

    Project 8600GTX

    Hello,

    I had a simple plan. Connect working VRM from 8800GTX (bcoz all Evga stuff is too expensive for me) to 8600GT and make some scores. I bought dead 8800GTX and working 8600GT Sonic + and connected external VRM. There are quite a lot of modifications:

    - vgpu mod, tested range is 1.3-1.9v
    - vmem regulation, tested range 1.5v-2.5v
    - connected vsense pins (when cutting the pcb, these connections where cutted too), it provides much more stable voltage
    - one 3300uf capacitor soldered on 8600GT board, probably no gain


    Pictures of the card:










    Voltages are really stable, fluctuation of vmem is around 0.003v, on vgpu 0.02v. Vdrop is small to - 0.05V. I know that I don't have many wires, and they're too long, but I don't think it'll make a noticeable difference in clocks. I'd get more gain changing cooling to at least a decent single stage.

    Card was cooled waterchiller (MCW60 block), coolant has temperature around -28C, vgpu ~1.75V, vmem 2.03V. 1067Mhz @ Core is one of the best clocks in the world made on this card, so I'm really happy with it It was done around 3 months ago, but still most of my scores are placed high on Hwbot.

    http://hwbot.org/submission/2316031_...r3_77431_marks

    http://hwbot.org/submission/2316027_...r3_30552_marks

    http://hwbot.org/submission/2316029_...r3_19668_marks

    http://hwbot.org/submission/2316034_...3_278404_marks

    http://hwbot.org/submission/2316028_...r3_10329_marks

    I still had this card in working condition, so I'll made round two some day, this time with better cpu and cooling.

    Best regards

  2. #2
    Champion
    Join Date
    Jan 2004
    Location
    Athens , Hellas
    Posts
    556
    Nice stuff ! Just love this kind of o/c !!

  3. #3
    Xtreme Enthusiast
    Join Date
    Sep 2008
    Posts
    519
    awesome modding skill.
    congrats.

  4. #4
    Xtreme Member
    Join Date
    Dec 2012
    Location
    Buenos Aires
    Posts
    307
    Very nice work!
    I gotta do stuff like this...what's next? Using a 3770k and a z77 board?

  5. #5
    Banned Movieman...
    Join Date
    May 2009
    Location
    illinois
    Posts
    1,810
    I miss my 8600GT's those things were beast to me back in the day. of course i was coming from a ati radeon 9250 ROFL

    EDIT:
    found my old post. I think i ended up getting it to 810 on the core. this was on the stock air cooling with the shroud removed and 120's surrounding it

    http://www.xtremesystems.org/forums/...-GT&highlight=
    get a second and do sli now lol
    Last edited by stangracin3; 12-23-2012 at 09:48 PM.

  6. #6
    Registered User
    Join Date
    Dec 2012
    Location
    Pittsburgh, PA, US
    Posts
    5
    Oh man, this is absolutely absurd! Very impressive!

  7. #7
    Wanna look under my kilt?
    Join Date
    Jun 2005
    Location
    Glasgow-ish U.K.
    Posts
    4,509
    ....and there was me thinking the 8800GTX/ Ultra PWM was complete crap.

    VERY nice work bro!!!
    Quote Originally Posted by T_M View Post
    Not sure i totally follow anything you said, but regardless of that you helped me come up with a very good idea....
    Quote Originally Posted by soundood View Post
    you sigged that?

    why?
    ______

    Sometimes, it's not your time. Sometimes, you have to make it your time. Sometimes, it can ONLY be your time.

  8. #8
    Hardware Nightmare
    Join Date
    May 2004
    Location
    Taipei :)
    Posts
    855
    I'd suggest soldering ground wires closer to GPU.
    Also putting some 0805/0603 MLCCs and POSCAPs right behind GPU could give you 25-50MHz too.
    Usual rule - more capacitance is better when it's close to point of load, not somewhere in another galaxy at PCB corner.

    Cheers.
    Taking GND reference from another galaxy

    Electronics engineering @ extreme overclocker
    LN2: Cel347@8199.5MHz,920@5300,E8600@6610,QX9650@5700,X 3050@4311,X3470@5060

  9. #9
    Registered User
    Join Date
    Sep 2008
    Posts
    67
    Very nice work
    Sorry for my bad english


  10. #10
    Xtreme Member
    Join Date
    Jul 2008
    Location
    Poland
    Posts
    378
    Quote Originally Posted by TiN_ View Post
    I'd suggest soldering ground wires closer to GPU.
    Also putting some 0805/0603 MLCCs and POSCAPs right behind GPU could give you 25-50MHz too.
    Usual rule - more capacitance is better when it's close to point of load, not somewhere in another galaxy at PCB corner.
    Cheers.
    Thanks for the tips But in my opinion better cooling is the way to go. 8600GT core is so small, I had positive temperatures in load. I've noticed, that shader clock scales very well with temperature and around these frequencies it has the biggest influence on scores. Also better cpu woulnd't hurt too.

  11. #11
    Wanna look under my kilt?
    Join Date
    Jun 2005
    Location
    Glasgow-ish U.K.
    Posts
    4,509
    I hope you removed that plastic shim around the core before benching Every time I get a card with one of those, I remove it and I get up to 15 degrees lower temps.
    Quote Originally Posted by T_M View Post
    Not sure i totally follow anything you said, but regardless of that you helped me come up with a very good idea....
    Quote Originally Posted by soundood View Post
    you sigged that?

    why?
    ______

    Sometimes, it's not your time. Sometimes, you have to make it your time. Sometimes, it can ONLY be your time.

  12. #12
    Xtreme Member
    Join Date
    Oct 2009
    Location
    Louisville, KY
    Posts
    413
    Quote Originally Posted by K404 View Post
    I hope you removed that plastic shim around the core before benching Every time I get a card with one of those, I remove it and I get up to 15 degrees lower temps.
    Every time I get a card without one of those, I crush the core


    i7 920 / X58A-OC / Dominator GT 2000 7-8-7 / 5870 Lightning

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •